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Home >> Subaru >> 2017 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.0L) >> Crankshaft Position Sensor >> Inspection >> Crankshaft Position Sensor (Method With Oscilloscope)
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Crankshaft Position Sensor (Method With Oscilloscope)

  1. Disconnect the ground terminal from battery sensor. <Ref. to BATTERY , NOTE, Note.>
  2. Prepare an oscilloscope.
  3. Remove the engine control module (ECM). <Ref. to REMOVAL , Engine Control Module (ECM).>
  4. Install the ST between the ECM and bulkhead harness and the engine harness. <Ref. to CAUTION , General Description.>

    ST 18460AA030 CHECK BOARD

  5. Connect the ground terminal to battery sensor. <Ref. to BATTERY , NOTE, Note.>
  6. Connect the probe to ST.
    Fig 1: Checking Waveforms And Voltage Of ECM
    G11574610Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Probe
    19 +
    31 -
  7. Start the engine and let it idle.
  8. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Engine Control Module (ECM) I/O Signal". <Ref. to Engine Control Module (ECM) I/O Signal .>
  9. After inspection, install the related parts in the reverse order of removal.
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